Stock Photo - Karez in the Turfan Depression of Xinjiang, China The karez, a system of shafts and subterranean aquaeducts, function as horizontal wells that collect and carry snow and glacier melt from the nearby Tian Shan mountain range to appointed oases The karez system, avoiding pumps and relying on natural gravity, is most propably modelled on Persia´s qanats

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